NO.6 BRAKE SYSTEM WARNING LIGHT STAYS ON MORE THAN 4 SECONDS WITH IGNITION SWITCH ON [ABS]

id0403a5809000

6	BRAKE system warning light stays on more than 4 seconds with ignition switch on. (Parking brake is released.)
[TROUBLESHOOTING HINTS] •  Instrument cluster or ABS HU/CM malfunction •  Short to GND in circuit in parking brake switch •  Parking brake switch or brake fluid level sensor stuck on. •  Short to GND in wiring between parking brake switch and BCM. •  Short to GND in wiring between brake fluid level sensor and BCM.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT BRAKE FLUID LEVEL •  Is brake fluid level normal?	Yes	Go to next step.
		No	Add brake fluid.
2	INSPECT DTCS IN INSTRUMENT CLUSTER •  Retrieve instrument cluster DTC using the M-MDS. •  Is DTC U0415:92 displayed?	Yes	Retrieve the DTC for ABS and repair or replace malfunctioning part necessary.
		No	Go to the next step.
3	INSPECT WHETHER MALFUNCITON IS IN INSTRUMENT CLUSTER OR ELSEWHERE •  Release the parking brake. •  Turn off all warning light and indicator light using M-MDS simulation function WL+IL? (See ACTIVE COMMAND MODES TABLE [INSTRUMENT CLUSTER].) •  Does the ABS warning light turn off?	Yes	Go to the next step.
		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
4	INSPECT WTHERE MALFUNCTION IS IN BRAKE SYSTEM WARNING LIGHT RELATED SWITCHES OR ELSE WHERE •  Inspect following parts for continuity. ―  Parking brake switch (See PARKING BRAKE SWITCH INSPECTION.) ―  Brake fluid level sensor (See BRAKE FLUID LEVEL SENSOR INSPECTION.) •  Is the continuity condition normal?	Yes	Go to the next step.
		No	Repair or replace malfunctioning part. (See PARKING BRAKE LEVER REMOVAL/INSTALLATION [L.H.D.].) (See PARKING BRAKE LEVER REMOVAL/INSTALLATION [R.H.D.].) (See MASTER CYLINDER REMOVAL/INSTALLATION [L.H.D.].) (See MASTER CYLINDER REMOVAL/INSTALLATION [R.H.D.].)
5*	INSPECT FOR SHORT TO GND CIRCUIT IN WIRING BETWEEN BCM AND BRAKE SYSTEM WARNING LIGHT RELATED SWITCHES •  Inspect for open circuit in wiring for following: ―  Between parking switch and BCM terminal 7B ―  Between brake fluid level sensor and BCM terminal 4A •  Is the short to GND circuit detected?	Yes	Repair or replace malfunctioning part.
		No	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)